Get-Mailbox -Resultsize Unlimited | Get-MailboxStatistics | Select-Object DisplayName, LastInteractionTime | Export-CSV -NoTypeInformation -Path c:\temp\mailboxes.csv
Get-Mailbox -Resultsize Unlimited | Get-MailboxStatistics | Select-Object DisplayName, LastInteractionTime | Export-CSV -NoTypeInformation -Path c:\temp\mailboxes.csv